US10852882B2 - Fingerprint sensing control method for fingerprint sensing device - Google Patents

Fingerprint sensing control method for fingerprint sensing device Download PDF

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Publication number
US10852882B2
US10852882B2 US16/600,545 US201916600545A US10852882B2 US 10852882 B2 US10852882 B2 US 10852882B2 US 201916600545 A US201916600545 A US 201916600545A US 10852882 B2 US10852882 B2 US 10852882B2
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fingerprint sensing
sensing
sensitivity
units
fingerprint
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US20200042138A1 (en
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Chih-Chang Lai
Kuan-Yi Yang
Jer-Hao Hsu
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Priority claimed from US14/970,559 external-priority patent/US9996187B2/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041661—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes

Definitions

  • the present invention relates to a touch control method for a touch device, and more particularly, to a touch control method capable of increasing sensitivity of a touch device.
  • touch panels of an in-cell structure attract lots of attention. Via building sensing elements inside the display structure of the panel, the in-cell structure eliminates a layer. The visible distance between the user's finger and what the user is touching on the touch panel is therefore reduced, creating a more direct contact with the content displayed and enabling taps and gestures to be more responsive. In addition, the touch panel becomes thinner since the layer is eliminated in the in-cell structure.
  • the touch panel of the in-cell structure senses the touches according to capacitance variances of a plurality of touch pads in response to the touches.
  • a smaller area of each of the touch pads can acquire a greater touch resolution of the touch panel.
  • the capacitance variance generated by each of the touch pads also becomes smaller when the area of each of the touch pads decreases.
  • the touch panel may fail to determine a hover operation because the capacitance variance generated by each of the touch pads is too small to be determined when the user's hand maintains a certain distance with the touch panel. Thus, how to improve the reliability of determining the hover operation while maintaining the fine touch resolution of the touch panel becomes a topic to be discussed.
  • the present invention provides a touch control method capable of increasing sensitivity of a touch device.
  • the present invention discloses a fingerprint sensing control method for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of sensing units, the sensing control method comprising calculating a first sensing value according to a first plurality of sensing signals from a first number of one or more sensing units to provide a first sensitivity of the fingerprint sensing device; and calculating a second sensing value according to a second plurality of sensing signals from a second number of one or more sensing units to provide a second sensitivity of the fingerprint sensing device, wherein the second sensitivity is greater than the first sensitivity, and the second number is greater than the second number.
  • the present invention discloses a fingerprint sensing control module for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of fingerprint sensing units
  • the fingerprint sensing control module comprising: a sensing module, coupled to the fingerprint sensing units, and configured to obtain the one or more fingerprint sensing signals from the fingerprint sensing device, and generate a sensing result based on the one or more fingerprint sensing signals; wherein under an operation of a first sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a first number of one or more sensing areas each including a first number of one or more fingerprint sensing units of the fingerprint sensing units, and under an operation of a second sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a second number of sensing areas each including a second number of one or more fingerprint
  • the touch control method of the present invention By utilizing the touch control method of the present invention, not only the sensitivity of the touch device can be increased but also the power consumption of the touch device can be reduced.
  • FIG. 1 is a schematic diagram of an electronic system according to an example of the present invention.
  • FIG. 4 is a schematic diagram of an electronic system according to an example of the present invention.
  • FIG. 7A is a schematic diagram for explaining an algorithm of calculating a centroid coordinate of a touch device.
  • FIG. 7B is a schematic diagram of a sensing area according to an example of the present invention.
  • FIG. 8 is a schematic diagram of a computer system according to an example of the present invention.
  • FIG. 1 is a schematic diagram of an electronic system 10 according to an example of the present invention.
  • the electronic system 10 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein.
  • the electronic system 10 comprises a touch device 100 and a sensing device 102 .
  • the components not directly related to the concept of the present invention, such as housing, display components, and display control circuit, are not shown in FIG. 1 for brevity.
  • the touch device 100 may be a touch pad configured in a display panel and comprises a plurality of touch units P 11 -Pmn (e.g. sensing pads).
  • FIG. 1 shows touch units P 11 -P 44 for illustrations.
  • the touch device 100 is utilized for generating capacitance variances in response to at least one approaching or touch of an object (e.g. a fingertip or a stylus pen).
  • the sensing device 102 comprises a touch control module TCM and a sensing module 104 and is utilized for determining the capacitance variances generated by the touch units P 11 -Pmn.
  • the touch control module TCM is capable of connecting the multiple touch units among the touch units P 11 -Pmn (e.g. the touch units P 11 , P 12 , P 21 , and P 22 ), so as to increase the sensitivity of the touch device 100 .
  • the switch units SW 1 _ 11 -SW 1 _ mn are respectively coupled between one of the touch units P 11 -Pmn and one of sensing units SU 1 _ 11 -SU 1 _ mn of the sensing module 104 , and each of the switch units SW 2 _ 11 -SW 2 _ ij is coupled between the touch units located in one of a plurality of sensing areas SA_ 11 -SA_ij and one of the sensing units SU 2 _ 11 -SU 2 _ ij .
  • Each of the sensing areas SA_ 11 -SA_ij comprises multiple neighborhood touch units among the touch units P 11 -Pmn and the sensing module 104 .
  • the touch units P 11 , P 12 , P 21 , and P 22 are coupled to the switch units SW 1 _ 11 , SW 1 _ 12 , SW 1 _ 21 , and SW 1 _ 22 , respectively, and the sensing units SU 1 _ 11 , SU 1 _ 12 , SU 1 _ 21 , and SU 1 _ 22 are coupled to the switch units SW 1 _ 11 , SW 1 _ 12 , SW 1 _ 21 , and SW 1 _ 22 .
  • the sensing area SA_ 11 comprises touch units P 11 , P 12 , P 21 , and P 22 that form a 2*2 touch unit array; the sensing area SA_ 12 comprises touch units P 13 , P 14 , P 23 , and P 24 that form another 2*2 touch unit array; and so on.
  • the touch control module TCM selects to conduct the switch units SW 1 _ 11 -SW 1 _ mn or the switch units SW 2 _ 11 -SW 2 _ ij according to a control signal CON and an inverse control signal CONB which is an inverse signal of the control signal CON.
  • the control signal CON and the inverse control signal CONB are generated by a control unit (not shown in FIG. 1 ) and the control unit may be configured in the sensing module 104 .
  • the switch units SW 1 _ 11 -SW 1 _ mn are conducted in a normal mode
  • the switch units SW 2 _ 11 -SW 2 _ ij are conducted in a grouping mode
  • the switch units SW 1 _ 11 -SW 1 _ mn and the switch units SW 2 _ 11 -SW 2 _ ij are not conducted simultaneously.
  • the switch units SW 1 _ 11 -SW 1 _ mn are conducted.
  • the sensing units SU 1 _ 11 -SU 1 _ mn of the sensing module 104 receive the signals related to capacitance variances CV 1 _ 11 -CV 1 _ mn respectively generated in the touch units P 11 -Pmn.
  • the sensing module 104 determines the capacitance variances CV 1 _ 11 -CV 1 _ mn respectively generated in the touch units P 11 -Pmn and accordingly determines the touch positions at which the object approaches or contacts.
  • the sensing module 104 is able to determine the approaching or the contact of the object in a fine touch resolution of the level of touch units P 11 -Pmn.
  • the capacitance variance generated by each of the touch units P 11 -Pmn reduces significantly. For example, when the object contacts the touch device 100 (i.e. the distance between the object and the touch device 100 is 0), the capacitance variances generated in each of the touch units contacted by the object may be 0.9 pF.
  • the capacitance variances generated in each of the touch units close to the object may reduce to 0.1 pF.
  • the capacitance variance generated by each of the touch units P 11 -Pmn in response to the approaching of the object may be too small to make the sensing module 104 determine the approaching of the object.
  • the touch device 100 change to operate in a grouping mode.
  • the control unit adjusts the control signal CON and the inverse control signal CONB to make the touch control module TCM disconnect the switch units SW 1 _ 11 -SW 1 _ mn and conduct the switch units SW 2 _ 11 -SW 2 _ ij , to connect the touch units in the same sensing area together.
  • the touch units in the same sensing area are connected together by the switch units SW 2 _ 11 -SW 2 _ ij (e.g.
  • the sensing module 104 changes to use the sensing units SU 2 _ 11 -SU 2 _ ij to determine capacitance variances CV 2 _ 11 -CV 2 _ ij jointly generated by the touch units in the same sensing area among the sensing areas SA_ 11 -SA_ij.
  • the area of generating each of the capacitance variances CV 2 _ 11 -CV 2 _ ij is greater than that of generating each of the capacitance variances CV 1 _ 11 -CV 1 _ mn .
  • the capacitance variances CV 2 _ 11 -CV 2 _ ij in response to the approaching or the contact of the object are greater than the capacitance variances CV 1 _ 11 -CV 1 _ mn in response to the approaching or the contact of the object.
  • the capacitor variances CV 2 _ 11 -CV 2 _ ij generated in response to the approaching or the contact of the object and sensed by the sensing module 104 are enlarged.
  • the sensing module 104 is able to determine the approaching of the object when the object maintains a certain distance with the touch device 100 and the capacitance variance generated by each of the touch units P 11 -Pmn is too small to allow the sensing module 104 to determine the approaching of the object.
  • the sensitivity of the touch device 100 is therefore increased.
  • the power consumption of the sensing module 104 decreases when conducting the switch units SW 2 _ 11 -SW 2 _ ij because the number of times of scanning the capacitance variances generated in the touch device 100 is decreased from m*n to i*j and the time of scanning the capacitance variances in the touch device 100 is also decreased.
  • the switch unit SW 1 _ 11 and the switch SW 2 _ 11 _ 1 of the switch unit SW 2 _ 11 can be regarded as a multiplexer controlled by the control signal CON and the inverse control signal CONB; the switch unit SW 1 _ 12 and the switch SW 2 _ 11 _ 2 of the switch unit SW 2 _ 11 can be regarded as another multiplexer controlled by the control signal CON and the inverse control signal CONB; and so on.
  • the touch control module TCM shown in FIG. 1 can be realized by a plurality of multiplexers controlled by the control signal CON and the inverse control signal CONB.
  • the multiplexers conduct the connections between each of the touch units P 11 -Pmn and each of the sensing units SU 1 _ 11 -SU 1 _ mn or conduct the connections between each of the touch units P 11 -Pmn and each of the sensing units SU 2 _ 11 -SU 2 _ ij according to the control signal CON.
  • FIG. 3 is a schematic diagram of an electronic system 30 according to an example of the present invention.
  • the electronic system 30 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein. Because the electronic system 30 is similar to the electronic system 10 shown in FIG. 1 , the components and signals with the same functions use the same symbols.
  • each of the sensing areas SA_ 11 -SA_ij comprises 9 touch units that form a 3*3 touch unit array.
  • the sensing area SA_ 11 comprises the touch units P 11 -P 13 , P 21 -P 23 , and P 31 -P 33 in FIG. 3 .
  • the switch units SW 2 _ 11 -SW 2 _ ij are conducted in the grouping mode, the touch units located in the same sensing area are connected together and the sensing units SU 2 _ 11 -SU 2 _ ij respectively determine the capacitance variances CV 2 _ 11 -CV 2 _ ij in the sensing areas SA_ 11 -SA_ij. Since the areas of the sensing areas SA_ 11 -SA_ij increases in FIG. 3 , the sensitivity of the electronic system 30 determining the approaching or the contact of the object is further increased.
  • the number of times of scanning the capacitance variances generated by the touch device 300 in FIG. 3 is a ninth of the number of times of scanning the capacitance variances generated by the touch device 100 in FIG. 1 .
  • the power consumption of the sensing module 304 is reduced with the number of times of scanning the capacitance variances.
  • the timing of the sensing module 104 switching to conduct the switch units SW 1 _ 11 -SW 1 _ mn or SW 2 _ 11 -SW 2 _ ij may be various.
  • the sensing module 104 changes to conduct the switch units SW 2 _ 11 -SW 2 _ ij when determining that the electronic system 10 performs a specific function that does not require high touch resolution (e.g. an electronic book application).
  • the sensing module 104 changes to conduct the switch units SW 1 _ 11 -SW 1 _ mn.
  • the sensing module 104 changes to conduct the switch units SW 2 _ 11 -SW 2 _ ij when determining the object perform a predefined touch pattern.
  • the predefined touch pattern may be “S” pattern.
  • the sensing module 104 changes to conduct the switch units SW 2 _ 11 -SW 2 _ ij .
  • the predefined touch pattern may be a contact pattern of the object.
  • the sensing module 104 determines that, according to the capacitance variances CV 1 _ 11 -CV 1 _ mn , the object contacts a fourth area of the touch device 100 , the sensing module 104 disconnects the switch units SW 1 _ 11 -SW 1 _ mn and conducts the switch units SW 2 _ 11 -SW 2 _ ij.
  • the sensing module 104 disconnects the switch units SW 2 _ 11 -SW 2 _ ij and conducts the switch units SW 1 _ 11 -SW 1 _ mn.
  • the sensing module 104 alternately conducts the switch units SW 1 _ 11 -SW 1 _ mn and the switch units SW 2 _ 11 -SW 2 _ ij and adjusts the ratio between the times of conducting the switch units SW 1 _ 11 -SW 1 _ mn and those of conducting the switch units SW 2 _ 11 -SW 2 _ ij .
  • the sensing module 104 changes to conduct the switch units SW 2 _ 11 -SW 2 _ ij 7 times and to conduct the switch units SW 1 _ 11 -SW 1 _ mn 3 times per 10 times of scanning the capacitance variances in the touch device 100 .
  • the sensing module 104 disconnects the switch units SW 1 _ 11 -SW 1 _ mn and conducts the switch units SW 2 _ 11 -SW 2 _ ij when the electronic system 10 enters a power saving mode, to lower the power consumption of the sensing module 104 .
  • the sensing module 104 disconnects the SW 2 _ 11 -SW 2 _ ij and changes to conduct the switch units SW 1 _ 11 -SW 1 _ mn.
  • the touch control module TCM of the above examples is capable of connecting multiple touch units in the touch device, to increase the sensitivity of the touch device. According to different application and design concepts, those skilled in the art may observe appropriate alternations and modifications.
  • the shapes of the sensing areas SA_ 11 -SA_mn is not limited to be rectangles. That is, the touch units in the same sensing area are not limited to form a rectangle.
  • the shapes of the sensing areas SA_ 11 -SA_mn are rectangles, circles or half-circles.
  • Step 506 Sense one or more the touch signals from the touch device.
  • the sensing module determines whether to increase a sensitivity of the touch device according to the operations of the electronic system. In an example, the sensing module determines to increase the sensitivity of the touch device when the touch device performs a specific function that does not require high touch resolution (e.g. an electronic book application). In another example, the sensing module determines to increase the sensitivity of the touch device when determining the one or more touch signals perform a predefined touch pattern on the touch device.
  • the predefined touch pattern may be a move pattern of the object (e.g. “S” move pattern) or a contact pattern of the object.
  • each of the sensing areas When determining to increase the sensitivity of the touch device, the touch units in each of a plurality of sensing areas are connected together.
  • the shape of each of the sensing area may be altered according to different applications and design concepts.
  • each of the sensing areas may be a rectangle, a circle, or a half-circle.
  • the touch control module determines the capacitance variances generated by the touch units in each of the sensing areas, to sense one or more touch signals from the touch device. Since the area of single touch units is smaller than that of the sensing areas comprising multiple touch units, the sensitivity of the touch device is increased when multiple touch units in the same sensing area are connected together.
  • Step 602 Alternately, electrically connect the touch units in each of a plurality of sensing areas.
  • Step 604 Determine a plurality of first capacitance variances of the plurality of sensing areas and determine a plurality of second capacitance variances of the plurality of touch units, separately, in each of the sensing areas, to sense the one or more touch signals.
  • the idea of utilizing different groups/amounts of touch switches is not limited to any specific implementations.
  • the hardware mechanism utilizing switches may be extended to software mechanism which may not need physical switches. This means that any implementation that allows the touch information sensed by the touch units to be “grouped”, e.g. summed, can be realized, wherein the sensing module can obtain the respective touch information from each of the touch units.
  • the resolution may not necessarily be reduced when the sensitivity is increased.
  • touch information from m*n touch units can be summed for a larger sensitivity and touch information for (m/2)*(n/2) touch units can be summed for a smaller sensitivity.
  • only one capacitance or capacitance variances or sensing data corresponding to one among four touch units in each sensing area can be used to obtain a lower sensitivity.
  • four capacitances or capacitance variances or sensing data corresponding to four touch units in each sensing area can be summed to obtain a higher (4 times) sensitivity.
  • the resolution of each unit of (m/2)*(n/2) touch units can be calculated to be four times of the resolution of each unit of m*n touch units, then the resolution of (m/2)*(n/2) touch units can be the same as the resolution of m*n touch units.
  • FIG. 7A is a schematic diagram for explaining an algorithm of calculating a centroid coordinate of a touch device.
  • a sensing area SX of the touch device is located at an i th and i+1 th column of the m*n touch units, and the sensing area SX includes sensing areas SA_ 11 , SA_ 12 , SA_ 21 and SA_ 22 , wherein capacitances (or capacitance variances or sensing data) x 1 , x 2 , x 3 and x 4 respectively correspond to the sensing areas SA_ 11 , SA_ 12 , SA_ 21 and SA_ 22 .
  • the capacitance or capacitance variance or sensing data for each of the touch units P 11 , P 12 , P 21 and P 22 has a lower value or is varied in a smaller range.
  • the capacitance or sensing data for the sensing area SA_ 11 is calculated as (S 11 +S 12 +S 21 +S 22 )/4, wherein S 11 , S 12 , S 21 , S 22 respectively denote the capacitance or sensing data corresponding to the touch units P 11 , P 12 , P 21 and P 22 within the sensing area SA_ 11 .
  • the capacitance or sensing data for the sensing area SA_ 12 is calculated as (S 13 +S 14 +S 23 +S 24 )/4, wherein S 13 , S 14 , S 23 , S 24 respectively denote the capacitance or sensing data corresponding to the touch units P 13 , P 14 , P 23 , P 24 within the sensing area SA_ 12 .
  • the X coordinate of the centroid coordinate may be therefore calculated as (a*x 1 +b*x 2 )/(x 1 +x 2 ), wherein a and b may denote coordinates of the sensing areas SA_ 11 and SA_ 12 along a row direction when x 1 or x 2 is the capacitance (or largest capacitance variance) along the row direction.
  • the Y coordinate of the centroid coordinate may be calculated in a similar way.
  • the capacitance or sensing data for each sensing areas SA_ 11 , SA_ 12 , SA_ 21 , or SA_ 22 has a larger value or is varied in a larger range compared to the first embodiment.
  • the capacitance or capacitance variance or sensing data for the sensing area SA_ 11 is calculated as (S 11 +S 12 +S 21 +S 22 ), wherein S 11 , S 12 , S 21 , S 22 respectively denote the capacitance or capacitance variance or sensing data corresponding to the touch units P 11 , P 12 , P 21 and P 22 within the sensing area SA_ 11 .
  • the capacitance or sensing data for the sensing area SA_ 12 is calculated as (S 13 +S 14 +S 23 +S 24 ), wherein S 13 , S 14 , S 23 , S 24 respectively denote the capacitance or capacitance variance or sensing data corresponding to the touch units P 13 , P 14 , P 23 , P 24 within the sensing area SA_ 12 .
  • the X coordinate of the centroid coordinate may be therefore calculated as (a*x 1 +b*x 2 )/(x 1 +x 2 ), wherein a and b may denote coordinates of the sensing areas SA_ 11 and SA_ 12 along a row direction when x 1 or x 2 is the largest capacitance (or capacitance variance) along the row direction.
  • the Y coordinate of the centroid coordinate may be calculated in a similar way.
  • the way how the capacitance value (or capacitance variance value) for each sensing area is calculated can lead to a different resolution.
  • the resolution can remain the same or can be decreased/increased when the sensitivity is increased/decreased.
  • the second embodiment can have a resolution four times of the resolution of the first embodiment even when the sensitivity is both increased to be four times (2*2 touch units are utilized in calculating the capacitance for each sensing area).
  • the resolution of the touch device when the sensitivity of the touch device is increased by (virtually or physically) increasing the numbers of touch units in each sensing area (e.g., from one to four) used for calculating the capacitance (or capacitance variance or sensing data) corresponding to the sensing area, the resolution is decreased in the first embodiment.
  • the resolution can be maintained in the second embodiment.
  • FIG. 8 is a schematic diagram of a computer system 80 according to an example of the present invention.
  • the computer system 80 may be utilized for realizing the image enhancement method stated above, but is not limited herein.
  • the computer system 80 may include a processing means 800 such as a microprocessor or Application Specific Integrated Circuit (ASIC), a storage unit 810 and a communication interfacing unit 820 .
  • the storage unit 810 may be any data storage device that can store a program code 812 , accessed and executed by the processing means 800 . Examples of the storage unit 810 include but are not limited to a subscriber identity module (SIM), read-only memory (ROM), flash memory, random-access memory (RAM), CD-ROM/DVD-ROM, magnetic tape, hard disk and optical data storage device.
  • SIM subscriber identity module
  • ROM read-only memory
  • flash memory random-access memory
  • CD-ROM/DVD-ROM magnetic tape
  • hard disk hard disk and optical data storage device.
  • the disclosure is not limited to a self-capacitance touch method/device such as shown in the above embodiments but can also be applied to a mutual-capacitance touch method/device, which may comprise a sensing controller having a plurality of drive lines and a plurality of sense lines coupled to a plurality of touch units; a source for driving a current or voltage separately though each drive line; and a sensing circuit that monitors the capacitance at the sensing lines.
  • One or more different numbers of touch units can be physically or virtually grouped so as to achieve different sensitivities.
  • the disclosure is not limited to touch sensing device/method, but may be applied to different types of sensing device such as fingerprint sensing device/method.
  • a fingerprint sensor may include a FPR (fingerprint) sensing array including a plurality of FPR sensing units, a readout module, and a processor.
  • Each of the FPR sensing units can include a FPR sensing electrode.
  • the readout module can reads a sensing voltage of the FPR sensing electrode of each of the FPR sensing units, and provides a sensing output according to the sensing voltage.
  • One or more different numbers of FPR sensing units can be physically or virtually grouped so as to achieve different sensitivities.
  • the touch control module of the above examples is capable of connecting multiple touch units, to increases the area of generating the capacitance variance.
  • the sensitivity of the touch device is therefore increased.
  • the power consumption of the electronic system is reduced because the number of times of scanning the capacitance variances decreases when the multiple touch units are connected together.

Abstract

A fingerprint sensing control method for sensing one or more sensing signals from a fingerprint sensing device having a plurality of sensing areas, each of the sensing areas having a plurality of sensing units, the sensing control method includes determining a sensitivity of the fingerprint sensing device; and obtaining the one or more the fingerprint sensing signals from the fingerprint sensing device, wherein one or more of the plurality of sensing units are grouped so as to achieve the sensitivity, and for a first sensitivity of the sensing device, a first number of one or more sensing units are grouped, and for a second sensitivity of the fingerprint sensing device, a second number of one or more sensing units are grouped, and the second sensitivity is greater than the first sensitivity and the second number is greater than the first number.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of U.S. Ser. No. 15/979,488 filed on 2018 May 15, which is a continuation-in-part application of U.S. Ser. No. 14/970,559 filed on 2015 Dec. 16. U.S. Ser. No. 14/970,559 further claims the benefit of U.S. Provisional Application No. 62/167,279 filed on 2015 May 28.
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a touch control method for a touch device, and more particularly, to a touch control method capable of increasing sensitivity of a touch device.
2. Description of the Prior Art
Along with the development of the touch sensing technique, the commercially available touch panels are extensively used for various sizes or products such as mobile phone, GPS navigator system, tablet PC, PDA, and laptop PC, owing to their convenience and practicality.
The panel manufacturers continue to develop thinner and more accurate touch panels. In recent year, touch panels of an in-cell structure attract lots of attention. Via building sensing elements inside the display structure of the panel, the in-cell structure eliminates a layer. The visible distance between the user's finger and what the user is touching on the touch panel is therefore reduced, creating a more direct contact with the content displayed and enabling taps and gestures to be more responsive. In addition, the touch panel becomes thinner since the layer is eliminated in the in-cell structure.
The touch panel of the in-cell structure senses the touches according to capacitance variances of a plurality of touch pads in response to the touches. A smaller area of each of the touch pads can acquire a greater touch resolution of the touch panel. However, the capacitance variance generated by each of the touch pads also becomes smaller when the area of each of the touch pads decreases. The touch panel may fail to determine a hover operation because the capacitance variance generated by each of the touch pads is too small to be determined when the user's hand maintains a certain distance with the touch panel. Thus, how to improve the reliability of determining the hover operation while maintaining the fine touch resolution of the touch panel becomes a topic to be discussed.
SUMMARY OF THE INVENTION
In order to solve the above problem, the present invention provides a touch control method capable of increasing sensitivity of a touch device.
In an aspect, the present invention discloses a fingerprint sensing control method for sensing one or more sensing signals from a fingerprint sensing device having a plurality of sensing areas, each of the sensing areas having a plurality of sensing units, the sensing control method comprising: determining a sensitivity of the fingerprint sensing device; and obtaining the one or more the fingerprint sensing signals from the fingerprint sensing device, wherein one or more of the plurality of sensing units are grouped so as to achieve the sensitivity, and for a first sensitivity of the sensing device, a first number of one or more sensing units are grouped, and for a second sensitivity of the fingerprint sensing device, a second number of one or more sensing units are grouped, and the second sensitivity is greater than the first sensitivity and the second number is greater than the first number.
In another aspect, the present invention discloses a fingerprint sensing control method for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of sensing units, the sensing control method comprising calculating a first sensing value according to a first plurality of sensing signals from a first number of one or more sensing units to provide a first sensitivity of the fingerprint sensing device; and calculating a second sensing value according to a second plurality of sensing signals from a second number of one or more sensing units to provide a second sensitivity of the fingerprint sensing device, wherein the second sensitivity is greater than the first sensitivity, and the second number is greater than the second number.
In another aspect, the present invention discloses a computer system, comprising: a processing device; and a memory device coupled to the processing device, for storing a program code instructing the processing device to perform a fingerprint sensing control method, wherein the fingerprint sensing control method comprises determining a sensitivity of the fingerprint sensing device; grouping one or more of a plurality of fingerprint sensing units located in the same sensing area so as to achieve the sensitivity of the fingerprint sensing device; and sensing one or more the fingerprint sensing signals from the fingerprint sensing device.
In another aspect, the present invention discloses a non-transitory machine-readable medium having information recorded thereon for rendering sensing units of a fingerprint sensing device, wherein the information, when read by the machine, causes the machine to perform the following: determining a sensitivity of the fingerprint sensing device; grouping one or more of fingerprint sensing units so as to achieve the sensitivity of the fingerprint sensing device; and sensing one or more fingerprint sensing signals from the fingerprint sensing device.
In another aspect, the present invention discloses a control logic coupled to a fingerprint sensing device, configured to receive sensing information and render the sensing information into control signals for driving the fingerprint sensing device, to perform the following: determining a sensitivity of the fingerprint sensing device; grouping one or more of fingerprint sensing units so as to achieve the sensitivity of the fingerprint sensing device; and sensing one or more fingerprint sensing signals from the fingerprint sensing device.
In another aspect, the present invention discloses a fingerprint sensing control module for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of fingerprint sensing units, the fingerprint sensing control module comprising: a sensing module, coupled to the fingerprint sensing units, and configured to obtain the one or more fingerprint sensing signals from the fingerprint sensing device, and generate a sensing result based on the one or more fingerprint sensing signals; wherein under an operation of a first sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a first number of one or more sensing areas each including a first number of one or more fingerprint sensing units of the fingerprint sensing units, and under an operation of a second sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a second number of sensing areas each including a second number of one or more fingerprint sensing units of the fingerprint sensing units; wherein the first sensitivity is different from the second sensitivity and the first number is different from the second number, such that different numbers of fingerprint sensing units are used to provide fingerprint sensing information and the fingerprint sensing device therefore has different sensitivities.
By utilizing the touch control method of the present invention, not only the sensitivity of the touch device can be increased but also the power consumption of the touch device can be reduced.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of an electronic system according to an example of the present invention.
FIG. 2 is a schematic diagram of an electronic system according to an example of the present invention.
FIG. 3 is a schematic diagram of an electronic system according to an example of the present invention.
FIG. 4 is a schematic diagram of an electronic system according to an example of the present invention.
FIG. 5 is a flowchart of a process according to an example of the present invention.
FIG. 6 is a flowchart of another process according to an example of the present invention.
FIG. 7A is a schematic diagram for explaining an algorithm of calculating a centroid coordinate of a touch device.
FIG. 7B is a schematic diagram of a sensing area according to an example of the present invention.
FIG. 8 is a schematic diagram of a computer system according to an example of the present invention.
 DETAILED DESCRIPTION
Please refer to FIG. 1, which is a schematic diagram of an electronic system 10 according to an example of the present invention. The electronic system 10 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein. As shown in FIG. 1, the electronic system 10 comprises a touch device 100 and a sensing device 102. Note that, the components not directly related to the concept of the present invention, such as housing, display components, and display control circuit, are not shown in FIG. 1 for brevity. The touch device 100 may be a touch pad configured in a display panel and comprises a plurality of touch units P11-Pmn (e.g. sensing pads). FIG. 1 shows touch units P11-P44 for illustrations. The touch device 100 is utilized for generating capacitance variances in response to at least one approaching or touch of an object (e.g. a fingertip or a stylus pen). The sensing device 102 comprises a touch control module TCM and a sensing module 104 and is utilized for determining the capacitance variances generated by the touch units P11-Pmn. In this example, the touch control module TCM is capable of connecting the multiple touch units among the touch units P11-Pmn (e.g. the touch units P11, P12, P21, and P22), so as to increase the sensitivity of the touch device 100.
In details, the touch control module TCM comprises switch units SW1_11-SW1_mn and SW2_11-SW2_ij, wherein the switch units SW1_11-SW1_22 and SW2_11 are shown in FIG. 1 for illustrations. The switch units SW1_11-SW1_mn are respectively coupled between one of the touch units P11-Pmn and one of sensing units SU1_11-SU1_mn of the sensing module 104, and each of the switch units SW2_11-SW2_ij is coupled between the touch units located in one of a plurality of sensing areas SA_11-SA_ij and one of the sensing units SU2_11-SU2_ij. Each of the sensing areas SA_11-SA_ij comprises multiple neighborhood touch units among the touch units P11-Pmn and the sensing module 104. In FIG. 1, the touch units P11, P12, P21, and P22 are coupled to the switch units SW1_11, SW1_12, SW1_21, and SW1_22, respectively, and the sensing units SU1_11, SU1_12, SU1_21, and SU1_22 are coupled to the switch units SW1_11, SW1_12, SW1_21, and SW1_22. The sensing area SA_11 comprises touch units P11, P12, P21, and P22 that form a 2*2 touch unit array; the sensing area SA_12 comprises touch units P13, P14, P23, and P24 that form another 2*2 touch unit array; and so on. The touch control module TCM selects to conduct the switch units SW1_11-SW1_mn or the switch units SW2_11-SW2_ij according to a control signal CON and an inverse control signal CONB which is an inverse signal of the control signal CON. The control signal CON and the inverse control signal CONB are generated by a control unit (not shown in FIG. 1) and the control unit may be configured in the sensing module 104. In an example, the switch units SW1_11-SW1_mn are conducted in a normal mode, the switch units SW2_11-SW2_ij are conducted in a grouping mode, and the switch units SW1_11-SW1_mn and the switch units SW2_11-SW2_ij are not conducted simultaneously.
In a normal mode, the switch units SW1_11-SW1_mn are conducted. The sensing units SU1_11-SU1_mn of the sensing module 104 receive the signals related to capacitance variances CV1_11-CV1_mn respectively generated in the touch units P11-Pmn. The sensing module 104 determines the capacitance variances CV1_11-CV1_mn respectively generated in the touch units P11-Pmn and accordingly determines the touch positions at which the object approaches or contacts. Since the capacitance variances CV1_11-CV1_mn are respectively generated by the touch units P11-Pmn, the sensing module 104 is able to determine the approaching or the contact of the object in a fine touch resolution of the level of touch units P11-Pmn. When the object maintains a certain distance respect to the touch device 100 (e.g. perform a hover operation), however, the capacitance variance generated by each of the touch units P11-Pmn reduces significantly. For example, when the object contacts the touch device 100 (i.e. the distance between the object and the touch device 100 is 0), the capacitance variances generated in each of the touch units contacted by the object may be 0.9 pF. In comparison, when the distance between the object and the touch device 100 is 1 mm, the capacitance variances generated in each of the touch units close to the object may reduce to 0.1 pF. Under such a condition, the capacitance variance generated by each of the touch units P11-Pmn in response to the approaching of the object may be too small to make the sensing module 104 determine the approaching of the object.
In order to increase the sensitivity of the touch device 100, the touch device 100 change to operate in a grouping mode. In the grouping mode, the control unit adjusts the control signal CON and the inverse control signal CONB to make the touch control module TCM disconnect the switch units SW1_11-SW1_mn and conduct the switch units SW2_11-SW2_ij, to connect the touch units in the same sensing area together. Please refer to FIG. 2, the touch units in the same sensing area are connected together by the switch units SW2_11-SW2_ij (e.g. the touch units P11, P12, P21, and P22 are connected together when switches SW2_11_1-SW2_11_4 of the switch unit SW2_11 are conducted). The sensing module 104 changes to use the sensing units SU2_11-SU2_ij to determine capacitance variances CV2_11-CV2_ij jointly generated by the touch units in the same sensing area among the sensing areas SA_11-SA_ij. Since the number of touch units of generating each of the capacitance variances CV2_11-CV2_ij is greater than that of touch units of generating each of the capacitance variances CV1_11-CV1_mn, the area of generating each of the capacitance variances CV2_11-CV2_ij (i.e. the area of each of the sensing areas SA_11-SA_ij) is greater than that of generating each of the capacitance variances CV1_11-CV1_mn (i.e. the area of each of the touch units P11-Pmn). Thus, the capacitance variances CV2_11-CV2_ij in response to the approaching or the contact of the object are greater than the capacitance variances CV1_11-CV1_mn in response to the approaching or the contact of the object. In other words, the capacitor variances CV2_11-CV2_ij generated in response to the approaching or the contact of the object and sensed by the sensing module 104 are enlarged. According to the enlarged capacitor variances CV2_11-CV2_ij, the sensing module 104 is able to determine the approaching of the object when the object maintains a certain distance with the touch device 100 and the capacitance variance generated by each of the touch units P11-Pmn is too small to allow the sensing module 104 to determine the approaching of the object. The sensitivity of the touch device 100 is therefore increased. In addition, the power consumption of the sensing module 104 decreases when conducting the switch units SW2_11-SW2_ij because the number of times of scanning the capacitance variances generated in the touch device 100 is decreased from m*n to i*j and the time of scanning the capacitance variances in the touch device 100 is also decreased.
Note that, the switch unit SW1_11 and the switch SW2_11_1 of the switch unit SW2_11 can be regarded as a multiplexer controlled by the control signal CON and the inverse control signal CONB; the switch unit SW1_12 and the switch SW2_11_2 of the switch unit SW2_11 can be regarded as another multiplexer controlled by the control signal CON and the inverse control signal CONB; and so on. In other words, the touch control module TCM shown in FIG. 1 can be realized by a plurality of multiplexers controlled by the control signal CON and the inverse control signal CONB. The multiplexers conduct the connections between each of the touch units P11-Pmn and each of the sensing units SU1_11-SU1_mn or conduct the connections between each of the touch units P11-Pmn and each of the sensing units SU2_11-SU2_ij according to the control signal CON.
According to different applications and design concepts, the number of the touch units connected by the switch units SW2_11-SW2_ij can be altered. Please refer to FIG. 3, which is a schematic diagram of an electronic system 30 according to an example of the present invention. The electronic system 30 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein. Because the electronic system 30 is similar to the electronic system 10 shown in FIG. 1, the components and signals with the same functions use the same symbols. In FIG. 3, each of the sensing areas SA_11-SA_ij comprises 9 touch units that form a 3*3 touch unit array. For example, the sensing area SA_11 comprises the touch units P11-P13, P21-P23, and P31-P33 in FIG. 3. When the switch units SW2_11-SW2_ij are conducted in the grouping mode, the touch units located in the same sensing area are connected together and the sensing units SU2_11-SU2_ij respectively determine the capacitance variances CV2_11-CV2_ij in the sensing areas SA_11-SA_ij. Since the areas of the sensing areas SA_11-SA_ij increases in FIG. 3, the sensitivity of the electronic system 30 determining the approaching or the contact of the object is further increased. In addition, the number of times of scanning the capacitance variances generated by the touch device 300 in FIG. 3 is a ninth of the number of times of scanning the capacitance variances generated by the touch device 100 in FIG. 1. The power consumption of the sensing module 304 is reduced with the number of times of scanning the capacitance variances.
The timing of the sensing module 104 switching to conduct the switch units SW1_11-SW1_mn or SW2_11-SW2_ij may be various. In an example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij when determining that the electronic system 10 performs a specific function that does not require high touch resolution (e.g. an electronic book application). When determining that the electronic system 10 ends the specific function, the sensing module 104 changes to conduct the switch units SW1_11-SW1_mn.
In an example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij when determining the object perform a predefined touch pattern. For example, the predefined touch pattern may be “S” pattern. When determining that the object draws “S” according to the capacitance variances CV1_11-CV1_mn, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij. In another example, the predefined touch pattern may be a contact pattern of the object. For example, when the sensing module 104 determines that, according to the capacitance variances CV1_11-CV1_mn, the object contacts a fourth area of the touch device 100, the sensing module 104 disconnects the switch units SW1_11-SW1_mn and conducts the switch units SW2_11-SW2_ij.
In another example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij according to the capacitance variances CV1_11-CV1_mn and a signal transmitted from the object. For example, the object may be a stylus pen capable of transmitting a signal in a specific frequency band. When determining receiving the signal in the specific frequency band (i.e. determines the object is the stylus pen) and the capacitance variances in response to the approaching or the contact of the object exceeds a threshold, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij. When the signal in the specific frequency band disappears or the capacitance variances in response to the approaching or the contact of the object become smaller than the threshold, the sensing module 104 disconnects the switch units SW2_11-SW2_ij and conducts the switch units SW1_11-SW1_mn.
In an example, the sensing module 104 alternately conducts the switch units SW1_11-SW1_mn and the switch units SW2_11-SW2_ij and adjusts the ratio between the times of conducting the switch units SW1_11-SW1_mn and those of conducting the switch units SW2_11-SW2_ij. For example, the sensing module 104 conducts the switch units SW1_11-SW1_mn for determining the capacitance variances CV1_11-CV1_mn 7 times and conducts the switch units SW2_11-SW2_ij for determining the capacitance variances CV2_11-CV2_ij 3 times per 10 times of scanning the capacitance variances in the touch device 100. When determining the capacitance variances in responses to the approaching or the contact of the object among the capacitance variances CV1_11-CV1_mn and CV2_11-CV2_ij are saturated, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij 7 times and to conduct the switch units SW1_11-SW1_mn 3 times per 10 times of scanning the capacitance variances in the touch device 100. In an example, the capacitance variances in responses to the approaching or the contact of the object and among the capacitance variances CV1_11-CV1_mn are saturated if capacitance variances in responses to the approaching or the contact of the object reach a threshold TH1, and the capacitance variances in responses to the approaching or the contact of the object and among the capacitance variances CV2_11-CV2_ij are saturated if capacitance variances in responses to the approaching or the contact of the object reach a threshold TH2. The threshold TH2 is greater than the threshold TH1 because the number of the touch units generating each of the capacitance variances CV2_11-CV2_ij is greater than that of the touch units generating each of the capacitance variances CV1_11-CV1_mn. For example, the threshold TH2 is four times the threshold TH1 when each of the sensing areas SA_11-SA_ij comprises 4 touch units. The sensing module 104 may change to conduct the switch units SW1_11-SW1_mn 7 times and to conduct the switch units SW2_11-SW2_ij 3 times per 10 times of scanning the capacitance variances in the touch device 100 when determining the capacitance variances in responses to the approaching or the contact of the object among the capacitance variances CV1_11-CV1_mn maintain saturated and the capacitance variances in responses to the approaching or the contact of the object among CV2_11-CV2_ij are not saturated.
In an example, the sensing module 104 disconnects the switch units SW1_11-SW1_mn and conducts the switch units SW2_11-SW2_ij when the electronic system 10 enters a power saving mode, to lower the power consumption of the sensing module 104. After the electronic system 10 wakes up and enters a normal operation mode, the sensing module 104 disconnects the SW2_11-SW2_ij and changes to conduct the switch units SW1_11-SW1_mn.
The touch control module TCM of the above examples is capable of connecting multiple touch units in the touch device, to increase the sensitivity of the touch device. According to different application and design concepts, those skilled in the art may observe appropriate alternations and modifications. For example, the shapes of the sensing areas SA_11-SA_mn is not limited to be rectangles. That is, the touch units in the same sensing area are not limited to form a rectangle. In an example, the shapes of the sensing areas SA_11-SA_mn are rectangles, circles or half-circles.
Please refer to FIG. 4, which is a schematic diagram of an electronic system 40 according to an example of the present invention. The electronic system 40 is similar to the electronic system 10 shown in FIG. 1, thus the components and signals with similar functions use the same symbols. Different from FIG. 1, the touch control module TCM changes to be configured in the touch device 400. The connection relationships between the touch units P11-Pmn and the switch units SW1_11-SW1_mn and SW2_11-SW2_ij shown in FIG. 4 can be referred to the above and are not narrated herein for brevity.
The method of the touch control module switching the connection between the touch device and the sensing module in the above examples can be summarized into a process 50 shown in FIG. 5. The process 50 is utilized for sensing one or more touch signals from a touch device having a plurality of sensing areas, wherein each of the sensing areas has a plurality of touch units. The process 50 comprises the following steps:
Step 500: Start.
Step 502: Determine whether to increase a sensitivity of the touch device, perform step 504 when determining to increase the sensitivity of the touch device, otherwise perform step 508.
Step 504: Electrically connect the plurality of touch units located in the same sensing area.
Step 506: Sense one or more the touch signals from the touch device.
Step 508: End.
According to the process 50, the sensing module determines whether to increase a sensitivity of the touch device according to the operations of the electronic system. In an example, the sensing module determines to increase the sensitivity of the touch device when the touch device performs a specific function that does not require high touch resolution (e.g. an electronic book application). In another example, the sensing module determines to increase the sensitivity of the touch device when determining the one or more touch signals perform a predefined touch pattern on the touch device. The predefined touch pattern may be a move pattern of the object (e.g. “S” move pattern) or a contact pattern of the object. In still another example, the sensing module determines to increase the sensitivity of the touch device when receiving a signal in the specific frequency band from the object approaching the electronic system and determining the capacitance variances of the plurality of touch units in response to the approaching or the contact of the object exceeds a threshold. In an example, the sensing module determines to increase the sensitivity of the touch device when the touch device enters a power saving mode.
When determining to increase the sensitivity of the touch device, the touch units in each of a plurality of sensing areas are connected together. The shape of each of the sensing area may be altered according to different applications and design concepts. For example, each of the sensing areas may be a rectangle, a circle, or a half-circle. After the touch units in each of the sensing areas are connected, the touch control module determines the capacitance variances generated by the touch units in each of the sensing areas, to sense one or more touch signals from the touch device. Since the area of single touch units is smaller than that of the sensing areas comprising multiple touch units, the sensitivity of the touch device is increased when multiple touch units in the same sensing area are connected together.
The method of the touch control module switching the connection between the touch device and the sensing module in the above examples can be summarized into a process 60 shown in FIG. 6. The process 60 is utilized for sensing one or more touch signals from a touch device with a plurality of sensing areas, wherein each of the sensing areas has a plurality of touch units. The process 60 comprises the following steps:
Step 600: Start.
Step 602: Alternately, electrically connect the touch units in each of a plurality of sensing areas.
Step 604: Determine a plurality of first capacitance variances of the plurality of sensing areas and determine a plurality of second capacitance variances of the plurality of touch units, separately, in each of the sensing areas, to sense the one or more touch signals.
Step 606: Adjust a frequency of alternately connecting the touch units in each of the sensing areas.
Step 608: End.
According to the process 60, the touch units in each of a plurality of sensing areas are alternately, electrically conducted (i.e. alternately switching between the normal mode and the grouping mode), to sense one or more touch signals from the touch device. In the grouping mode, the touch units in each of sensing areas are electrically connected together and a plurality of first capacitance variances of the plurality of sensing areas are determined. In the normal mode, the capacitance variance of each of touch units is acquired as one of a plurality of second capacitance variances. The one or more touch signals are sensed according to the first capacitance variances and the second capacitor variances.
The frequency of alternately conducting the touch units in each of the sensing areas is adjusted according to the first capacitance variances and the second capacitance variances in response to the one or more touch signals. For example, the touch units in each of the sensing areas are conducted 3 times per 10 times of scanning the capacitance variances in the touch device at first, to determine the second capacitance variances of the touch units are determined 7 times and the first capacitance variances of the sensing areas 3 times. When the first capacitance variances in response to the one or more touch signals are greater than a first threshold and the second capacitance variances in response to the one or more touch signals are greater than a second threshold, the frequency of alternately conducting the touch units in each of the sensing areas increases. For example, the touch units in each of the sensing areas change to be conducted 7 times per 10 times of scanning the capacitance variances in the touch device. When the first capacitance variances in response to the approaching or contact of the object is smaller than the first threshold and the second capacitance variances in response to the approaching or contact of the object maintain greater than the second threshold, the frequency of alternately conducting the plurality of touch units in each of the sensing areas decreases. For example, the touch units in each of the sensing areas change to be conducted 3 times per 10 times of scanning the capacitance variances in the touch device. Note that, the first threshold is greater than the second threshold because the number of the touch units generating each of the first capacitance variances is greater than that of the touch units generating each of the second capacitance variances. In an example, the first threshold is four times the second threshold when each of the sensing areas comprises 4 touch units.
It is noted that, the above mentioned embodiments utilize hardware mechanisms to implement different sensitivities. More specifically, in the embodiments shown in FIGS. 3 and 4, different switches controlling different groups including different amounts of touch units are conducted respectively to achieve different sensitivities. The sensitivity of the electronic system 40 determining the approaching or the contact of the object is higher than the sensitivity of the electronic system 30.
However, the idea of utilizing different groups/amounts of touch switches is not limited to any specific implementations. For example, the hardware mechanism utilizing switches may be extended to software mechanism which may not need physical switches. This means that any implementation that allows the touch information sensed by the touch units to be “grouped”, e.g. summed, can be realized, wherein the sensing module can obtain the respective touch information from each of the touch units.
In other words, “grouping” may not necessarily occur physically by implementing the hardware switches which can be arranged to connect different groups of switches and may be conducted at different times. In some implementations, the “grouping” may occur virtually on processing the touch information (indicating capacitance variances in response to a touch event) by combining or summing the touch information. Different sensitivities can be achieved by summing the touch information from different numbers of touch units in each sensing area. A greater number of grouped touch units or summed sensing data can lead to a greater sensitivity.
On the other hand, the resolution may not necessarily be reduced when the sensitivity is increased. For example, touch information from m*n touch units can be summed for a larger sensitivity and touch information for (m/2)*(n/2) touch units can be summed for a smaller sensitivity. In a specific implementation, only one capacitance or capacitance variances or sensing data corresponding to one among four touch units in each sensing area can be used to obtain a lower sensitivity. And four capacitances or capacitance variances or sensing data corresponding to four touch units in each sensing area can be summed to obtain a higher (4 times) sensitivity. If the resolution of each unit of (m/2)*(n/2) touch units can be calculated to be four times of the resolution of each unit of m*n touch units, then the resolution of (m/2)*(n/2) touch units can be the same as the resolution of m*n touch units.
Please refer to FIG. 7A, which is a schematic diagram for explaining an algorithm of calculating a centroid coordinate of a touch device. Assume that a sensing area SX of the touch device is located at an ith and i+1th column of the m*n touch units, and the sensing area SX includes sensing areas SA_11, SA_12, SA_21 and SA_22, wherein capacitances (or capacitance variances or sensing data) x1, x2, x3 and x4 respectively correspond to the sensing areas SA_11, SA_12, SA_21 and SA_22. The coordinate X can be calculated as (a*x1+b*x2)/(x1+x2), wherein a and b may denote coordinates of the sensing areas SA_11 and SA_12 along a row direction when x1 or x2 is the capacitance (capacitance variance) along the row direction. For example, the X coordinate of the centroid coordinate is X=(i*x1+(i+1)*x2)/(x1+x2). In other embodiments, X can be obtained as a weighted value of more than two coordinates (such as three coordinates) along the row direction. Similarly, an Y coordinate of the centroid coordinate may be determined according to capacitances or capacitance variances or sensing data corresponding to two or more sensing areas, such as, SA_11 and SA_21. Notably, the algorithm of the centroid coordinate is not limited to weighting, all kinds of methods for determining the centroid coordinate may be adopted in the present invention.
Please continue to refer to FIG. 7B, which is a schematic diagram of the sensing area SX according to an example of the present invention. The sensing areas SA_11, SA_12, SA_21 and SA_22 respectively include four touch units P11, P12, P21, P22, four touch units P13, P14, P23, P24, four touch units P_31, P32, P41, P42, and four touch units P33, P34, P43, P44. In a first embodiment when the sensitivity is increased to be four times while a resolution is decreased, the capacitance or capacitance variance or sensing data for each of the touch units P11, P12, P21 and P22 has a lower value or is varied in a smaller range. For example, the capacitance or sensing data for the sensing area SA_11 is calculated as (S11+S12+S21+S22)/4, wherein S11, S12, S21, S22 respectively denote the capacitance or sensing data corresponding to the touch units P11, P12, P21 and P22 within the sensing area SA_11. This may be achieved by electrically connecting the four touch units or alternatively by summing S11-S22 after respective touch signals are sensed from touch units. Similarly, the capacitance or sensing data for the sensing area SA_12 is calculated as (S13+S14+S23+S24)/4, wherein S13, S14, S23, S24 respectively denote the capacitance or sensing data corresponding to the touch units P13, P14, P23, P24 within the sensing area SA_12. And the X coordinate of the centroid coordinate may be therefore calculated as (a*x1+b*x2)/(x1+x2), wherein a and b may denote coordinates of the sensing areas SA_11 and SA_12 along a row direction when x1 or x2 is the capacitance (or largest capacitance variance) along the row direction. In addition, the Y coordinate of the centroid coordinate may be calculated in a similar way.
In a second embodiment, when the sensitivity is also increased to be four times while a resolution is maintained, the capacitance or sensing data for each sensing areas SA_11, SA_12, SA_21, or SA_22 has a larger value or is varied in a larger range compared to the first embodiment. For example, the capacitance or capacitance variance or sensing data for the sensing area SA_11 is calculated as (S11+S12+S21+S22), wherein S11, S12, S21, S22 respectively denote the capacitance or capacitance variance or sensing data corresponding to the touch units P11, P12, P21 and P22 within the sensing area SA_11. Similarly, the capacitance or sensing data for the sensing area SA_12 is calculated as (S13+S14+S23+S24), wherein S13, S14, S23, S24 respectively denote the capacitance or capacitance variance or sensing data corresponding to the touch units P13, P14, P23, P24 within the sensing area SA_12. And the X coordinate of the centroid coordinate may be therefore calculated as (a*x1+b*x2)/(x1+x2), wherein a and b may denote coordinates of the sensing areas SA_11 and SA_12 along a row direction when x1 or x2 is the largest capacitance (or capacitance variance) along the row direction. In addition, the Y coordinate of the centroid coordinate may be calculated in a similar way.
Comparing the first and second embodiments, it is noted that the way how the capacitance value (or capacitance variance value) for each sensing area is calculated can lead to a different resolution. This means that the resolution can remain the same or can be decreased/increased when the sensitivity is increased/decreased. More specifically, the second embodiment can have a resolution four times of the resolution of the first embodiment even when the sensitivity is both increased to be four times (2*2 touch units are utilized in calculating the capacitance for each sensing area). In other words, when the sensitivity of the touch device is increased by (virtually or physically) increasing the numbers of touch units in each sensing area (e.g., from one to four) used for calculating the capacitance (or capacitance variance or sensing data) corresponding to the sensing area, the resolution is decreased in the first embodiment. However, by having a greater range of capacitance variance, which can be achieved by not dividing the summation of capacitance values of the touch units by 4, the resolution can be maintained in the second embodiment.
In another embodiment, please refer to FIG. 8, which is a schematic diagram of a computer system 80 according to an example of the present invention. The computer system 80 may be utilized for realizing the image enhancement method stated above, but is not limited herein. The computer system 80 may include a processing means 800 such as a microprocessor or Application Specific Integrated Circuit (ASIC), a storage unit 810 and a communication interfacing unit 820. The storage unit 810 may be any data storage device that can store a program code 812, accessed and executed by the processing means 800. Examples of the storage unit 810 include but are not limited to a subscriber identity module (SIM), read-only memory (ROM), flash memory, random-access memory (RAM), CD-ROM/DVD-ROM, magnetic tape, hard disk and optical data storage device.
It is noted the disclosure is not limited to a self-capacitance touch method/device such as shown in the above embodiments but can also be applied to a mutual-capacitance touch method/device, which may comprise a sensing controller having a plurality of drive lines and a plurality of sense lines coupled to a plurality of touch units; a source for driving a current or voltage separately though each drive line; and a sensing circuit that monitors the capacitance at the sensing lines. One or more different numbers of touch units can be physically or virtually grouped so as to achieve different sensitivities. Furthermore, the disclosure is not limited to touch sensing device/method, but may be applied to different types of sensing device such as fingerprint sensing device/method. For example, a fingerprint sensor may include a FPR (fingerprint) sensing array including a plurality of FPR sensing units, a readout module, and a processor. Each of the FPR sensing units can include a FPR sensing electrode. The readout module can reads a sensing voltage of the FPR sensing electrode of each of the FPR sensing units, and provides a sensing output according to the sensing voltage. One or more different numbers of FPR sensing units can be physically or virtually grouped so as to achieve different sensitivities.
The touch control module of the above examples is capable of connecting multiple touch units, to increases the area of generating the capacitance variance. The sensitivity of the touch device is therefore increased. In addition, the power consumption of the electronic system is reduced because the number of times of scanning the capacitance variances decreases when the multiple touch units are connected together.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims (12)

What is claimed is:
1. A fingerprint sensing control method for sensing one or more sensing signals from a fingerprint sensing device having a plurality of sensing areas, each of the sensing areas having a plurality of sensing units, the sensing control method comprising:
determining a sensitivity of the fingerprint sensing device; and
obtaining the one or more the fingerprint sensing signals from the fingerprint sensing device, wherein one or more of the plurality of sensing units are grouped so as to achieve the sensitivity, and for a first sensitivity of the sensing device, a first number of one or more sensing units are grouped, and for a second sensitivity of the fingerprint sensing device, a second number of one or more sensing units are grouped, and the second sensitivity is greater than the first sensitivity and the second number is greater than the first number;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
2. The fingerprint sensing control method of claim 1, wherein the grouping comprises electrically connecting the one or more sensing units before the one or more fingerprint sensing signals are obtained from the fingerprint sensing device.
3. The fingerprint sensing control method of claim 1, wherein the grouping comprises summing sensing data of the one or more sensing units which are grouped after the one or more the fingerprint sensing signals are obtained from the fingerprint sensing device.
4. The fingerprint sensing control method of claim 1, wherein the step of determining the sensitivity of the fingerprint sensing device comprises:
determining to increase the sensitivity of the fingerprint sensing device when the fingerprint sensing device performs a specific function for a specific application requiring a higher sensitivity.
5. The fingerprint sensing control method of claim 1, wherein the step of determining the sensitivity of the fingerprint sensing device comprises:
determining to increase the sensitivity of the fingerprint sensing device when the one or more sensing signals perform a predefined sensing pattern.
6. The fingerprint sensing control method of claim 1, wherein the step of determining the sensitivity of the fingerprint sensing device comprises:
determining to increase the sensitivity of the fingerprint sensing device when the fingerprint sensing device enters a power saving mode.
7. A fingerprint sensing control method for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of sensing units, the sensing control method comprising:
calculating a first sensing value according to a first plurality of sensing signals from a first number of one or more sensing units to provide a first sensitivity of the fingerprint sensing device; and
calculating a second sensing value according to a second plurality of sensing signals from a second number of one or more sensing units to provide a second sensitivity of the fingerprint sensing device, wherein the second sensitivity is greater than the first sensitivity, and the second number is greater than the second number;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
8. A computer system, comprising:
a processing device; and
a memory device coupled to the processing device, for storing a program code instructing the processing device to perform a fingerprint sensing control method, wherein the fingerprint sensing control method comprises:
determining a sensitivity of a fingerprint sensing device;
grouping one or more of a plurality of fingerprint sensing units located in the same sensing area so as to achieve the sensitivity of the fingerprint sensing device; and
sensing one or more the fingerprint sensing signals from the fingerprint sensing device;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
9. A non-transitory machine-readable medium having information recorded thereon for rendering sensing units of a fingerprint sensing device, wherein the information, when read by the machine, causes the machine to perform the following:
determining a sensitivity of the fingerprint sensing device;
grouping one or more of fingerprint sensing units so as to achieve the sensitivity of the fingerprint sensing device; and
sensing one or more fingerprint sensing signals from the fingerprint sensing device;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
10. A control logic coupled to a fingerprint sensing device, configured to receive sensing information and render the sensing information into control signals for driving the fingerprint sensing device, to perform the following:
determining a sensitivity of the fingerprint sensing device;
grouping one or more of fingerprint sensing units so as to achieve the sensitivity of the fingerprint sensing device; and
sensing one or more fingerprint sensing signals from the fingerprint sensing device;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
11. A fingerprint sensing control module for sensing one or more fingerprint sensing signals from a fingerprint sensing device having a plurality of fingerprint sensing units, the fingerprint sensing control module comprising:
a sensing module, coupled to the fingerprint sensing units, and configured to obtain the one or more fingerprint sensing signals from the fingerprint sensing device, and generate a sensing result based on the one or more fingerprint sensing signals;
wherein under an operation of a first sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a first number of one or more sensing areas each including a first number of one or more fingerprint sensing units of the fingerprint sensing units, and under an operation of a second sensitivity of the fingerprint sensing device, the sensing module generates a sensing result based on the one or more fingerprint sensing signals from the fingerprint sensing units which are divided into a second number of sensing areas each including a second number of one or more fingerprint sensing units of the fingerprint sensing units;
wherein the first sensitivity is different from the second sensitivity and the first number is different from the second number, such that different numbers of fingerprint sensing units are used to provide fingerprint sensing information and the fingerprint sensing device therefore has different sensitivities;
wherein a resolution of the fingerprint sensing device maintains when the sensitivity of the fingerprint sensing device is varied.
12. The fingerprint sensing control module of claim 11, wherein the first number of one or more fingerprint sensing units are m1*n1 fingerprint sensing units, and the second number of one or more fingerprint sensing units are m2*n2 fingerprint sensing units, wherein m1, m2, n1 and n2 are positive integers and at least one of m1 and n1 is different respectively from m2 and n2.
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